ComboBox в шапке таблицы

QTableWidget *t1 = new QTableWidget;
QHeaderView *h = t1->horizontalHeader();
QComboBox *c = new QComboBox(h);

#include <QtGui>
#include <QtSql>
 
#include "datatable.h"
 
class HeaderObject : public QWidget{
public:
    HeaderObject(QWidget *parent = 0) : QWidget(parent){
        QComboBox *c = new QComboBox(this);
        QLabel *cb = new QLabel(this);
        c->addItem("test");
        c->addItem("test2");
        QGridLayout *l = new QGridLayout(this);
        l->addWidget(c);
        l->addWidget(cb);
        setLayout(l);
    }
};
class CustomHeader : public QHeaderView{
public:
    CustomHeader(QWidget *parent = 0):QHeaderView(Qt::Horizontal, parent){
 
        for(int i = 0; i<7; i++){
            headerSections.insert(i,new HeaderObject(this));
            headerSections[i]->hide();
        }
        setMinimumSectionSize(headerSections[0]->minimumSizeHint().width());
        setDefaultSectionSize(headerSections[0]->minimumSizeHint().width());
    }
protected:
    void paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const {
        if(headerSections[logicalIndex]->geometry() != rect){
            for(int i = 0; i < model()->columnCount(); ++i){
                QRect newRect(sectionViewportPosition(i), rect.y(), sectionSize(i), rect.height());
                headerSections[i]->setGeometry(newRect);
                if(!headerSections[i]->isVisible()) headerSections[i]->show();
            }
        }
    }
    QSize sizeHint() const {
        QSize s = size();
        s.setHeight(headerSections[0]->minimumSizeHint().height());
        return s;
    }
private:
    mutable QVector< QPointer <HeaderObject> > headerSections;
};
 
 
 
DataTable::DataTable(int count, QString instruction, QWidget *parent)
    : QWidget(parent)
{
    columnCount = count;
 
    model = new QSqlTableModel(this);
    model->setTable("IMPORT");
 
    model->select();
    view = new QTableView;
    view->setModel(model);
    view->setEditTriggers(QAbstractItemView::NoEditTriggers);
 
    view->setHorizontalHeader(new CustomHeader(view));
    view->resizeColumnsToContents();
    QVBoxLayout *mainLayout = new QVBoxLayout(this);
    mainLayout->addWidget(view);
    setLayout(mainLayout);
}